From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 17 Jul 2001 13:04:25 -0400 From: Ethan Blanton To: Benjamin Herrenschmidt Cc: linuxppc-dev@lists.linuxppc.org Subject: Re: Clock drift on an iBook2 Message-ID: <20010717130425.G22214@localhost.localdomain> References: <20010717102730.B22214@localhost.localdomain> <20010717165032.5490@smtp.adsl.oleane.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-md5; protocol="application/pgp-signature"; boundary="Q59ABw34pTSIagmi" In-Reply-To: <20010717165032.5490@smtp.adsl.oleane.com>; from benh@kernel.crashing.org on Tue, Jul 17, 2001 at 06:50:32PM +0200 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: --Q59ABw34pTSIagmi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Benjamin Herrenschmidt spake unto us the following wisdom: > >I have a new iBook2 and I'm having *severe* clock drift problems -- on > >the order of several seconds gained per minute. I'd like to get this > >taken care of, and it seems to be a linux problem as OSX appears to > >have a stable clock. >=20 > Are you using MOL or do you experience this with nothing special running ? Nothing special... I tried using ntpd to fix the problem, but it didn't seem to be able to set the system time and I'm not sure why. > Do you have the same issue if you disable powersave_nap (/proc/sys/ > kernel/powersave_nap) ? Yes, it seems to make no difference. (~4s of drift in 3 minutes either way, according to the tests I just did) > The TB is calibrated using the VIA, if we don't have a correct VIA freque= ncy > or if the calibration routine is slightly off, that may also explain the > problem. Looking into your next email regarding the VIA... Ethan --=20 If I've told you once, I've told you once And once is all that you needed. -- The Refreshments, "Carefree" --Q59ABw34pTSIagmi Content-Type: application/pgp-signature Content-Disposition: inline --Q59ABw34pTSIagmi-- ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/